dt-bindings: spi: add SG2044 SPI NOR controller driver

Add SPI NOR driver for SG2044, including read, write operations.

Signed-off-by: Longbin Li <looong.bin@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250304083548.10101-2-looong.bin@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/spi-sg2044-nor.yaml

@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spi-sg2044-nor.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SG2044 SPI NOR controller
+
+maintainers:
+  - Longbin Li <looong.bin@gmail.com>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    const: sophgo,sg2044-spifmc-nor
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+  - resets
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi@1000000 {
+      compatible = "sophgo,sg2044-spifmc-nor";
+      reg = <0x1000000 0x4000000>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+      clocks = <&clk 0>;
+      interrupts = <37 IRQ_TYPE_LEVEL_HIGH>;
+      resets = <&rst 0>;
+    };